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Let's use Amazon Kindle as a simple Smart Desk Calendar !
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"ecal.ink" is a simple service
that displays a calendar and clock on Kindle devices.

How to use

Make your calendar always visible

Kindle device goes into sleep mode after a while.
Since you want to keep the calendar and clock always visible, you can disable the sleep function by the following method.

How to turn off the sleep function

Kindle(4th,7th), Paperwhite(5th,6th), Voyage(7th)

Type three letters of Kindle's hidden command "~ds" into the search bar of Kindle or the address bar of Kindle web browser, and execute (Enter).
The screen will not switch, but it will not go to sleep until you reboot it.

Kindle(8th), Paperwhite(7th), Oasis(8th, 9th)

Connect your Kindle to a PC via USB and have it recognized as a drive.
Create an empty file named "TESTD_PREVENT_SCREENSAVER" in the root directory of the Kindle.
Disconnect the Kindle from the PC and restart the device.
If sleep mode is disabled, the process was successful.
This method has been confirmed to work on version 5.15.0 but does not work on version 5.16.9 (information suggests it stopped working from version 5.16.5).

Kindle(10th~), Paperwhite(10th~), Oasis(10th~), Scribe etc

Sleep mode cannot be disabled.
However, it might still work on versions prior to 5.16.4 if you don't update.

For more detailed information about Kindle devices, you can check from this button.
It summarizes the results of the research conducted to build this service and is published for the purpose of sharing knowledge.

Explore Kindle Research